Treesearch

Livestock producers’ operational perspectives and characteristics are known to be associated with silvopasture adoption, but findings in the literature are mixed and contradictory. To study whether characteristics or perspectives more closely relate tosilvopasture interest, 307 livestock producers enrolled in cost-share programs in Virginia, United States of America were surveyed. One hundred and thirty-nine producers responded (rate = 45%). Interest in silvopasture was measured using a Likert-type ordinal scale. Respondents reported the following operational characteristics: size in...

Silvopasture is the intentional integration of trees, forages, and livestock. Benefits of this agroforestry practice include shade for livestock, nutritious forage, and reduced wind speed in pastures, as well as ecosystem services and tree products. The literature indicate that some livestock producers are interested in silvopasture, but little is known about their establishment preferences and if they vary by demographics or operation type. This study hypothe- sized that producers are equally interested in planting trees in pastures (planting) and reducing forest canopy and planting...

A collection of 30 Phytophthora cactorum and 12 P. pseudotsugae (subclade 1a) strains isolated from several recent surveys across California was phylogenetically compared to a worldwide collection of 112 conspecific strains using sequences from three barcoding loci. The surveys baited P. cactorum from soil and water across a wide variety of forested ecosystems with a geographic range of more than 1000 km. Two cosmopolitan lineages were identified within the widespread P. cactorum, one being mainly associated with strawberry production and the other more closely associated with apple...

Accessibility of multispectral, multitemporal imagery combined with recent advances in cloud computing and machine learning approaches have enhanced our ability to model habitat characteristics across broad spatial and temporal scales. We integrated a large dataset of known nest and roost sites of a threatened species, the Mexican spotted owl (Strix occidentalis lucida), in the southwestern USA with Landsat imagery processed using the Continuous Change Detection and Classification (CCDC) time series algorithm on Google Earth Engine. We then used maximum entropy modeling (Maxent) to...

Biological invasions are among the most serious threats to native forest ecosystems worldwide due to ever-increasing international trade and global change. Understanding the invasion processes and ecology of invasive pests in both newly invaded and native habitats is necessary to effectively manage the risks they pose. The emerald ash borer (EAB), Agrilus planipennis, is one of the most devastating invasive forest insect pests in North America and has also invaded European Russia and parts of Europe. Through synthesizing historical data spanning >100 years and contemporary field observation...

This report summarizes the most recent Forest Inventory and Analysis data of Nevada’s forests based on field data collected between 2009 and 2018. Many of the results were compared to those from the 2004-2013 evaluation period. Results show that Nevada’s forest land covers 10.6 million acres, most of which (63 percent or 6.7 million acres) are administered by the United States Department of the Interior Bureau of Land Management. The State’s most abundant forest type is Pinyon-juniper woodland, which covers almost 7.3 million acres. At 1.9 billion live trees, woodland softwoods (principally...

For millennia, forest ecosystems in California have been shaped by fire from both natural processes and Indigenous land management, but the notion of climatic variation as a primary controller of the pre-colonial landscape remains pervasive. Understanding the relative influence of climate and Indigenous burning on the fire regime is key because contemporary forest policy and management are informed by historical baselines. This need is particularly acute in California, where 20th-century fire suppression, coupled with a warming climate, has caused forest densification and increasingly...

This resource bulletin consolidates data from the ninth complete survey of Tennessee’s forest resources, which was conducted during the period 2010–2014 (with additional data up to 2016) by the U.S. Department of Agriculture (USDA) Forest Service, Forest Inventory and Analysis (FIA) program in cooperation with the Tennessee Department of Agriculture Division of Forestry (TDF). Data on the extent, condition, and classification of forest land and associated timber volumes, as well as growth, removals, and mortality rates, are described and interpreted. Data on forest health and forest...

We revisited a Pinus ponderosa planting 32 years after it was established with one-year-old seedlings grown in copper-treated containers that modified their root systems. This technique was intended to promote more root egress after outplanting from the entire length of the root plug with a goal of providing greater stem stability. After excavating and digitizing the root systems of five treated and five non-treated plants, we observed that regardless of treatment, all trees initiated more roots and accumulated more root volume in apparent response to mechanical stresses invoked by wind...